Abstract: A metal container with thick walls, comprising various parts assembled and elded, and provided with at least one nozzle connecting it to a pipe and support means, each nozzle and the support means being manufactured integral with the part of the container on which they are located.

Abstract: In the surface oxidisation of an aluminium coating deposited on a steel st there is provided a process in which the aluminium coated sheet is passed through an enclosure in which there is a vacuum of from 10.sup.-.sup.1 to 10.sup.-.sup.3 Torr and in which remains residual gas which is acted upon by an electrical field so as to form positive ions aimed at an aluminium target from which are removed aluminium atoms which combine with oxygen present in the enclosure so as to form alumina which is deposited in a layer on the surface of the aluminium coating.